What is the likely impact of an OPSEC measure on operational effectiveness, if implemented? What is the probably risk to the mission success (effectiveness) if the unit does not implement the measure? What is the probable risk to the mission success, if an OPSEC measure does not work?
Suffocation is a general term to indicate that form of asphyxia, which is caused by deprivation of oxygen, either due to lack of oxygen in the environment or from obstruction of the air-passages.
Asphyxia: Nitrogen gas displaces oxygen causing potentially lethal hypoxia. Each litre of. liquid nitrogen expands to 0.7 cubic metre. Therefore, as little as 7 litres, if vaporised, can. completely displace the air in a passenger lift, and a smaller vaporised volume can result in. a lethal drop in oxygen level.